That Heavy Sack Of Presents
背重物
You should never carry something that weighs more than 10 percent of your body weight, especially when one shoulder is taking on most of the burden. In fact, doing so can cause back strains and sprains, muscle pulls, back spasms, difficulty walking and tingling and numbness down the arms and legs.
不要背超過自己體重10%的重物,尤其不要單肩背。背重物會導致背部拉傷和扭傷,肌肉拉傷,背部痙攣,行走困難,感覺刺痛,四肢麻木。